How does CSMA/CA work in a wireless network?
What will be an ideal response?
In CSMA/CA, a station waiting to transmit listens to determine if the communication frequency is idle. It determines if the frequency is idle by checking the Receiver Signal Strength Indicator (RSSI) level. The point at which the transmission frequency is idle is when there is the most risk of collisions by two or more stations that want to initiate a transmission at the same time. As soon as the frequency is idle, each station listens for DIFS seconds to make sure the frequency remains idle.
If the frequency remains idle for DIFS seconds, stations avoid a collision because each station
needing to transmit calculates a different amount of time to wait or a "backoff time" until
checking the frequency again to see if it is idle. If the frequency remains idle, the station with the shortest backoff time (delay time) transmits. If the frequency does not remain idle, stations that need to transmit wait until the frequency is idle and then wait again according to the backoff time they have already calculated.
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